Q.

Assertion: Synapse is a gap through which nerve impulse pass from one neuron to the next.
Reason: Neuron is the functional unit of nervous system.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but Reason is false.  
4 Assertion is false but Reason is true  

Ans.

(2)

Synapse and neuron has no relation regarding function. Neuron is the functional unit but that does not define synapse. Thus, both assertion and reason are correct but reason is not the correct explanation of the assertion.